title: Aluminium(III) amidinates formed from reactions of `AlCl' with lithium amidinates.
abstract: The disproportionation of AlCl(THF)n (THF is tetrahydrofuran) in the presence of lithium amidinate species gives aluminium(III) amidinate complexes with partial or full chloride substitution. Three aluminium amidinate complexes formed during the reaction between aluminium monochloride and lithium amidinates are presented. The homoleptic complex tris(N,N'-diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)3] or Al{PhC[N(i-Pr)]2}3, (I), crystallizes from the same solution as the heteroleptic complex chloridobis(N,N'-diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)2Cl] or Al{PhC[N(i-Pr)]2}2Cl, (II). Both have two crystallographically independent molecules per asymmetric unit (Z' = 2) and (I) shows disorder in four of its N(i-Pr) groups. Changing the ligand substituent to the bulkier cyclohexyl allows the isolation of the partial THF solvate chloridobis(N,N'-dicyclohexylbenzimidamido)aluminium(III) tetrahydrofuran 0.675-solvate, [Al(C19H27N2)2Cl]·0.675C4H8O or Al[PhC(NCy)2]2Cl·0.675THF, (III). Despite having a twofold rotation axis running through its Al and Cl atoms, (III) has a similar molecular structure to that of (II).
authors.affiliation: Indian Head Division, Naval Surface Warfare Center, 4104 Evans Way, Suite 102, Indian Head, MD 20640, USA.
authors.forename: Dennis H
authors.initials: DH
authors.lastname: Mayo
authors.forename: Yang
authors.initials: Y
authors.lastname: Peng
authors.forename: Peter
authors.initials: P
authors.lastname: Zavalij
authors.forename: Kit H
authors.initials: KH
authors.lastname: Bowen
authors.forename: Bryan W
authors.initials: BW
authors.lastname: Eichhorn
keywords: aluminium(III) amidinates; crystal structure; disorder